You can mute notifications at the team and room level. This article describes how to mute notifications at the team level.
On the smartphone app, on the team TEAMS tab, tap the Manage icon. On the Manage < Team Name > screen, in the Notification Preferences section, enable Mute Team.
On the Mute Team screen, you can select to mute the team for a time period ranging from 15 Mins to Forever.
On Desktop for Web or the Desktop app, on the TEAMS page, select the team you want to mute notifications for, click the More icon at the top right corner of the page, and then click Team Settings. On the Team Settings dialog, in the Notification Preferences section, click the Expand icon for Mute team as shown next.
Select the duration for which you want to mute the team, and then click Done.